bool

[Data Types]

Description

A bool holds one of two values, true or false. (Each bool variable occupies one byte of memory.)

Syntax

bool var = val;

Parameters

var: variable name
val: the value to assign to that variable

Example Code

This code shows how to use the bool datatype.

int LEDpin = 5;     // LED on pin 5
int switchPin = 13; // momentary switch on 13, other side connected to ground

bool running = false;

void setup() {
  pinMode(LEDpin, OUTPUT);
  pinMode(switchPin, INPUT);
  digitalWrite(switchPin, HIGH);  // turn on pullup resistor
}

void loop() {
  if (digitalRead(switchPin) == LOW) {
    // switch is pressed - pullup keeps pin high normally
    delay(100);                     // delay to debounce switch
    running = !running;             // toggle running variable
    digitalWrite(LEDpin, running);  // indicate via LED
  }
}

See also

  • Language String()

  • Language array

  • Language boolean

  • Language byte

  • Language char

  • Language double

  • Language float

  • Language int

  • Language long

  • Language short

  • Language size_t

  • Language string

  • Language unsigned char

  • Language unsigned int

  • Language unsigned long

  • Language void

  • Language word